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Modbus/TCP Discrete Input Access

This script is Copyright (C) 2006-2012 Tenable Network Security, Inc.

Synopsis :

Discrete inputs from a Modicon field device such as a PLC, RTU or IED
using Function Code 2 can be read.

Description :

The Modbus protocol function code of 2 reads discrete inputs from
Modbus slave commonly used by SCADA and DCS field devices. Discrete
inputs represent binary (i.e boolean) value that often map to
switches, relays, or other sensors. A sample of discrete inputs read
from the device are provided.

The ability to read discrete inputs may help an attacker profile a
system.

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